The form lines s is designed to break lines correctly when the file follows the Unix or MS-DOS convention. In other words, it will break a line at "\r\n" or "\n".
i1 : lines "a\nb\nc\n"
o1 = {a, b, c}
o1 : List
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i2 : peek oo
o2 = {"a", "b", "c"}
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i3 : lines "a\nb\nc\nd"
o3 = {a, b, c, d}
o3 : List
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i4 : peek oo
o4 = {"a", "b", "c", "d"}
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i5 : lines( ".", "a.b.c." )
o5 = {a, b, c}
o5 : List
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i6 : peek oo
o6 = {"a", "b", "c"}
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i7 : lines( ".", "a.b.c.d" )
o7 = {a, b, c, d}
o7 : List
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i8 : peek oo
o8 = {"a", "b", "c", "d"}
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